Lock



Patented Aug. 13, 1929.

vision of an improved tumbler UNITED STATES PATENTY or EDWARD N.

Application led .Tanuary 6; This invention has for an object the pro-` lock having means embodied therein whereby a smooth cam actionis provided between the cylinder vtail or cam and the lockingbolt to reduce frilction and insure the easy actuation of the Another object of this invention resides in the provision of an improved lock structure of the character described having a rod or lever member disposed between the cylinder carried cam or tail and the lockingbolt -or pin to produce a leverage on the locking bolt and increase thefmechanical advantage of the orce applied thereto by the cylinder cam or tail and insure a smoother operation of the lock. i

v A further object of this invention resides n the provision of an improved. lock of the character described in whichthe locking bolt is at all times normally rotated to its locked position.

And a still further object of this invention improved manner of assemis to provide an bling the lock. A

With the above and other objects in view which will appearas the description proceeds, my invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by the 'appended claims, it being understood'that such changes in the precise embodiment of the herein disclosed invention may be made as come within the scope ofthe claims.

In the accompanying drawing, I haveillustrated one complete example of the physical embodiment of my invention constructed according to the best mode I have so far devised for the practical application of the principles thereof, and in which:

Figure 1 is a view, partly in longitudinal section and partly in elevation, of a lock embodying my invention;

Figure 2 is a view, partly in section and partly in elevation, taken through Figure 1 on the plane of the line 2 2; and,-

Figure 3 is a fragmentary, erspective detail view of the inner end oi) the lock cylinder 'and lever detached from the cylinder mounting head and illustrating the locking bolt in phantom.

eferring now more particularly to the accompanying drawing, in which like numerals designate like parts throughout the tional slot of the cylinder.

on the inner end of the cy Fics.

1928. Serialv No. 244,891.

several views, 5 designates a lock cylinder mounting head having a central bore 6 extended throughout the major portion of its length and closed at its inner end by a wall 7. A transverse bore 8 is`located at the inner'endof the bore 6 and intersects its axis, the bore 8 communicating with the periphery of the mounting,r head 5 at one end to permit the projection therebeyond of the end 9 of the loc 'ng pin or boltlO reciprocally mounted within the bore 8.

The bolt 10 is of cylindrical forni having* its medial portion milled or otherwise 'cut out, as at 11, and its inner end 12 counterbored to receive one end of a 'spring 13, the other ends of w ich abuts the closed end 14 of bore 8 to normally urge the end 9 of the locking bolt beyond the periphery of the head 5.

` A lock cylinder 15 of conventional construction is rotatable withinA the bore 6 and v bore 6, the tumblers being retracted withinv the plane of thecylinder periphery upon insertion of a proper key 18 in the convenrIhe outer end 19 of the cylinder 15 extends beyond the outer end of head 5 and tits within a sealing cap 20 which is connected therewith for rotation by a projection or lug 2l on the which engages in one end of the capy key slot or opening 22 which aligns with the key-receiving opening of the cylinder. The cap 20 has an annular fiange or shoulder 23 over which the instruck annular fiange or rib 24 of a casing 25 engages, the inner end of the casing being laterally hanged, as at 26, and fitted within a. counterbore 27 at the base of the outer reduced portion'28 of the head 5 and there secured by spinning or crimping the material thereover, as at 29. In this manner the lock mechanism is assembled and a neat and strong structure provided. Y

A two step cam or tail piece 30 is formed inder 15, the first step 31 having an external diameter substantially concentric with' that of the cylinder proper but of a similar radius and preferably extending throughout more than 180 degrees and with its inside shape forming substantially an L. The second step 32 has the same external diameter as the first step but its ends terminateshort of the ends of the first What I claim as my invention is:

step, theend 33 thereof being spaced a greater distance from the adjacent end -of .theiirst step than its end 34 is spaced from its adjacentrfirst step end, for the reason later described.

The cam extends into the milled or cut away portion of the locking bolt 10 and in conventional constructions, the end or shoulder 35 of the cam -engages the wall 36 of the locking bolt eut away portion s'o, that upon rotation of the cylinder ina counterclockwise direction with respect to Figure 2, it cams thereagainst to retract the locking bolt against its spring 13. With the cam engaging directly on the wall 36. of the locking bolt, the friction between the parts interferes with the free movement of theflocking bolt by its spring when the pressure on the key 18 isfreleased In the present invention, a lever member 37 of approximately L shape is mounted within the bore 6 with the vertical portion .of the L interposed between the cam 30 and the locking bolt shoulder or wall 36, the horizontal or short arm 38 of the lever being pivoted in an aperture or well 39 in the end wall 7 of the mounting head and the longarm of the L passing through the'cut away portion 0f the locking bolt with its extreme outer end directedor bent laterally, as at 40, to normally rest on the surface or shoulder 41 formed between the ends 34 and 35 of the cam steps. The bend 42 at the outer end of the long arm of the L forms a fulcrum point engaging the shoulder 36 of the locking bolt and the bend 43 forms a fulcrum point engaging the end 34 of the cam step-32.

The lever 37 eliminates rubbing of the cam across the face 36 of the bolt and the'curved surfaces 42 and 43 of the lever are so formed that the pressure at the points of contact are substantially normal to those surfaces in the direction that will most effectively rotatethe cylinder and slide the bolt, respectively,'thus diminishing friction between the parts. The

long end 31 of the first cam step at all times extends 'over the lever 37 to prevent its disengagement from the aperture 3 9 and to prevent the end of the lever within the milled slot of the bolt 10 from riding over the shoulder 36 should the bolt rotate in its bore.

From the foregoing description, taken in connection with the accompanying drawing, f it will be readily evident to those skilled in the art to which an invention of the character described pertains, that I have provided a novel and improved lock assembly whereby friction betweenthe cylinder and the locking bolt is reduced to a minimum and the return of the bolt and cylinder to normal locking position at all times is assured, and further that a better manner of securing the assembly within the' mounting head is obtained 1. In a lock, a mounting head, a key controlled cylinder rotatable within the mount- `ing head, a cam projection on the inner end `of the cylinder, a locking bolt slidable in ,the mounting head and having a shoulder,

and a lever member having a portion transversely interposed between the cam projection and said lockingbolt shoulder' whereby,

rotation of the cylinder actuates the-locking bolt.

2. In a lock, a mounting head, a key lcontrolled cylinder rotatable within the mountinner end ofthe cylinder, the ends of the,

second step of the cam terminating inwardly vof the adjacent ends' of the first step of the cam, a locking bolt slidable inthe mounting head adjacent the inner end of the cylinder and having a medial cut away portion into which the cylinder cam projection extends, and a pivoted lever member having its free end disposed between one end of the cam and one end wall of the bolt cut away portion.

4. In a lock, a mounting head, a key controlled cylinder rotatable withinv themounting head, a projection on the inner end of the cylinder, a spring pressed locking bolt slidable in the mounting head adjacentrthe inner end of the cylinder and having a medial cut awayportion into whichvthe.

cylinder cam projection extends, and;l a pivoted lever member of substantially L shape and having one arm pivoted in an opening in the mounting head' .and -its other arm interposed between the camprojection and one wall of said locking bolt cut'- away portion.

5.! In a lock, a mounting head, akey controlled cylinder rotatable within the mount-'- ing head, a two step cam projection onthe inner end of the cylinder, the-ends of the second step of the cam terminating inwardly ofthe adjacent ends of the first step ofthe cam, a spring pressed locking bolt slidable in the mounting headadjacent the inner end of' the cylinder and having a medial cut aivay portion f into which the cylinder cam projection extends, .and -a pivoted lever member of substantially L shape and having one arm pivoted in an opening in the mounting.

head and its .other warm. interposed between .jection 'and one wall of the one end of the second step of the cain probolt cut away portion. l .f

6. In a lock, a mounting head, a key controlled cylinder rotatable within the mount-- ing head, a two step cam projection on the innerend of the cylinder, the `ends of the second step ofthe cam terminating inwardly ofA theadjacent ends of the first step of the cam, a spring pressed locking boltvslidable in the mounting head adjacent the inner end of the cylinder and having a medial cut away portion intowhich the cylinder cam prothe vouter end portion of said lever having op osed bends engaging the cam projection an the adjacent wall of the locking bolt cut away portion.

In testimony whereof, I hereunto aixmy.

signature.

EDWARD N. JAGOBI.

'and one wall Aofthe bolt cut away portion, i 

